[PATCH 2/4] rev-parse: suppress duplicate log limit exceeded message.

[Jon Seymour <jon.seymour@gmail.com>]

Modifies get_sha1_basic to accept a gently parameter to indicate
whether error should be used to report the log limit exceeded
condition.

Prior to this change, git rev-parse master@{99999} reported:

  error: Log for 'master' only has 166 entries.
  master@{99999}
  error: Log for 'master' only has 166 entries.
  fatal: ambiguous argument 'master@{99999}': unknown revision or path not in the working tree.
  Use '--' to separate paths from revisions

With this change, git rev-parse master@{99999} reports:

  master@{99999}
  error: Log for 'master' only has 166 entries.
  fatal: ambiguous argument 'master@{99999}': unknown revision or path not in the working tree.
  Use '--' to separate paths from revisions

Note: git rev-parse --verify master@{99999} now does not report
the error message although it does still exit with a non-zero
status code. This is fixed by the next commit.

Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
---
 sha1_name.c |   31 ++++++++++++++++---------------
 1 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/sha1_name.c b/sha1_name.c
index 82ad0f9..6e706eb 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -338,9 +338,9 @@ static inline int upstream_mark(const char *string, int len)
 	return 0;
 }
 
-static int get_sha1_1(const char *name, int len, unsigned char *sha1);
+static int get_sha1_1(const char *name, int len, unsigned char *sha1, int gently);
 
-static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
+static int get_sha1_basic(const char *str, int len, unsigned char *sha1, int gently)
 {
 	static const char *warn_msg = "warning: refname '%.*s' is ambiguous.";
 	char *real_ref = NULL;
@@ -375,7 +375,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 		ret = interpret_branch_name(str+at, &buf);
 		if (ret > 0) {
 			/* substitute this branch name and restart */
-			return get_sha1_1(buf.buf, buf.len, sha1);
+			return get_sha1_1(buf.buf, buf.len, sha1, 1);
 		} else if (ret == 0) {
 			return -1;
 		}
@@ -430,10 +430,11 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 					"back to %s.", len, str,
 					show_date(co_time, co_tz, DATE_RFC2822));
 			else {
-				error("Log for '%.*s' only has %d entries.",
-					len,
-					str,
-					co_cnt);
+				if (!gently)
+					error("Log for '%.*s' only has %d entries.",
+						len,
+						str,
+						co_cnt);
 				free(real_ref);
 				return -1;
 			}
@@ -448,7 +449,7 @@ static int get_parent(const char *name, int len,
 		      unsigned char *result, int idx)
 {
 	unsigned char sha1[20];
-	int ret = get_sha1_1(name, len, sha1);
+	int ret = get_sha1_1(name, len, sha1, 1);
 	struct commit *commit;
 	struct commit_list *p;
 
@@ -481,7 +482,7 @@ static int get_nth_ancestor(const char *name, int len,
 	struct commit *commit;
 	int ret;
 
-	ret = get_sha1_1(name, len, sha1);
+	ret = get_sha1_1(name, len, sha1, 1);
 	if (ret)
 		return ret;
 	commit = lookup_commit_reference(sha1);
@@ -504,7 +505,7 @@ struct object *peel_to_type(const char *name, int namelen,
 		namelen = strlen(name);
 	if (!o) {
 		unsigned char sha1[20];
-		if (get_sha1_1(name, namelen, sha1))
+		if (get_sha1_1(name, namelen, sha1, 1))
 			return NULL;
 		o = parse_object(sha1);
 	}
@@ -566,7 +567,7 @@ static int peel_onion(const char *name, int len, unsigned char *sha1)
 	else
 		return -1;
 
-	if (get_sha1_1(name, sp - name - 2, outer))
+	if (get_sha1_1(name, sp - name - 2, outer, 1))
 		return -1;
 
 	o = parse_object(outer);
@@ -614,7 +615,7 @@ static int get_describe_name(const char *name, int len, unsigned char *sha1)
 	return -1;
 }
 
-static int get_sha1_1(const char *name, int len, unsigned char *sha1)
+static int get_sha1_1(const char *name, int len, unsigned char *sha1, int gently)
 {
 	int ret, has_suffix;
 	const char *cp;
@@ -650,7 +651,7 @@ static int get_sha1_1(const char *name, int len, unsigned char *sha1)
 	if (!ret)
 		return 0;
 
-	ret = get_sha1_basic(name, len, sha1);
+	ret = get_sha1_basic(name, len, sha1, gently);
 	if (!ret)
 		return 0;
 
@@ -1059,7 +1060,7 @@ int get_sha1_with_context_1(const char *name, unsigned char *sha1,
 
 	memset(oc, 0, sizeof(*oc));
 	oc->mode = S_IFINVALID;
-	ret = get_sha1_1(name, namelen, sha1);
+	ret = get_sha1_1(name, namelen, sha1, gently);
 	if (!ret)
 		return ret;
 	/* sha1:path --> object name of path in ent sha1
@@ -1122,7 +1123,7 @@ int get_sha1_with_context_1(const char *name, unsigned char *sha1,
 			strncpy(object_name, name, cp-name);
 			object_name[cp-name] = '\0';
 		}
-		if (!get_sha1_1(name, cp-name, tree_sha1)) {
+		if (!get_sha1_1(name, cp-name, tree_sha1, 1)) {
 			const char *filename = cp+1;
 			ret = get_tree_entry(tree_sha1, filename, sha1, &oc->mode);
 			if (!gently) {
-- 
1.7.2.1.156.gf148c